SiO_(2)包覆对ZrCo储氢合金抗CO毒化性能的影响  

Effect of SiO_(2)Coating on the CO Poisoning Resistance of ZrCo Hydrogen Storage Alloy

作　　者：苏闽安 寇化秦[1] 叶荣兴 包锦春 周琳森 SU Min-an;KOU Hua-qin;YE Rong-xing;BAO Jin-chun;ZHOU Lin-sen(Institute of Materials,China Academy of Engineering Physics,Mianyang 621907,China)

机构地区：[1]中国工程物理研究院材料研究所,四川绵阳621907

出　　处：《稀有金属与硬质合金》2025年第1期89-97,共9页Rare Metals and Cemented Carbides

基　　金：国家自然科学基金项目(2030208,52371242);四川省自然科学基金项目(2020YJ0204,2023YFSY0021)。

摘　　要：为了提升ZrCo合金抗CO杂质气体毒化的能力,采用SiO_(2)溶胶包覆法将ZrCo合金颗粒嵌入SiO_(2)基体中制备了不同质量比的ZrCo/SiO_(2)复合材料,通过X射线衍射仪、扫描电子显微镜、透射电子显微镜和能量色散X射线谱仪等设备对样品的物相组成、微观形貌和元素组成进行表征。利用储氢材料性能测试装置研究了在H_(2)/CO混合气氛下,CO浓度、SiO_(2)包覆比例对ZrCo/SiO_(2)吸氢动力学性能的影响,使用动力学模型分析了样品的吸氢行为。实验结果表明:ZrCo储氢合金颗粒与SiO_(2)基体结合较好,在基体内均匀分布。SiO_(2)包覆有效提高了ZrCo合金在H_(2)/CO气氛中的吸氢速率,当ZrCo/SiO_(2)质量比为1∶1.5时,复合材料在含0.5%(摩尔分数)CO的H_(2)中达到饱和吸氢量仅需5 h,而未包覆的ZrCo需要55 h。ZrCo/SiO_(2)复合材料具有良好的抗CO毒化性能以及一定的抗循环粉化性能。In order to improve the poisoning resistance of ZrCo alloy against CO impurity gas,ZrCo alloy particles were embedded into SiO_(2)matrix by SiO_(2)sol coating method to prepare ZrCo/SiO_(2)composites with different mass ratios.The phase composition,micro-morphology,and elemental composition of the samples were characterized by X-ray diffractometer,scanning electron microscope,transmission electron microscope,and energy-dispersive X-ray spectrometer.The effects of CO concentration and SiO_(2)coating ratio on the hydrogen absorption kinetic performance of ZrCo/SiO_(2)were investigated by using a hydrogen storage material performance test device in a mixed H_(2)/CO atmosphere,and the hydrogen absorption behavior of the samples was analyzed by kinetic model.The experimental results show that ZrCo hydrogen storage alloy particles are well bonded with the SiO_(2)matrix and uniformly distributed in the matrix.The SiO_(2)coating effectively improves the hydrogen absorption rate of ZrCo alloy in H_(2)/CO atmosphere.When the mass ratio of ZrCo/SiO_(2)is 1∶1.5,it takes only 5 h for the composite to reach the saturation hydrogen absorption capacity in H_(2)containing 0.5%(molar ratio)CO,whereas it takes 55 h for the uncoated ZrCo.Therefore,the ZrCo/SiO_(2)composites have good CO poisoning resistance and certain cycling pulverization resistance.

关 键 词：ZrCo合金 储氢 SiO_(2) 溶胶 包覆 抗CO毒化性能 吸氢动力学 

分 类 号：TG139.7[一般工业技术—材料科学与工程]